Half to george a



(No Model.)

J.y G. MoQUILKIN. WRENCH.

No. 536,040. Patented Mar. 19, l1895.

VIA

Y .n c//////////////n W... m .nM e m T.

Attorney.

-Vitnesses: @fu

PATENT OFFICE.

JAMES C.- MCQUILKIN, OF INDUSTRY,

PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO GEORGE A. CLEAR, OF SAME PLACE.

' WRENCH.

SPECIFICATION forming part of Lettersl Patent No. 536,040, dated March19, 1895.

Serial No. 515.135. (No model.)

To all whom t may concern,.-

Be it known'that I, JAMES C. MCQUILKIN, a citizen of the United States,and a resident of Industry, in the county of Beaver and State ofPennsylvania, have invented certain new and useful Improvements inWrenches; and I do hereby declare that the `following is a full, clear,and exact description of the invention, which will enable others skilledin the art to which itappertains to make and use the same, referencebeing had to the accompanying drawings, which form a p'art of thisspecilication. g

Myinvention relates to that class of monkey wrenches in which the shankis formed with a series of rack teeth which engage a spring actuated keyor dog, carried by the movable jaw, so that the latter will beautomatically -locked in anykpositiou to which it may be adjusted.

The object of the invention is to provide an improved wrench ot' theabove character, in which the shank is formed with two sets of alignedrack teeth separated Yfrom each other by a central longitudinal rib toprevent injury thereto by pressuref the move able jaw, which jaw isprovided with two spring actuated dogs or keys, one in advance of theother a distance equal to one halt the distance'between the rack teethof either set or series, whereby a finer adj ustmcnt may be eected. t

The invention consists in the novel con-V struction and combination ofparts hereinafter fully described and claimed.

In the accompanying drawings: Figure l is a side elevation, partlybroken away, of a monkey wrench constructed in accordance with myinvention. Fig. 2 is a view looking from the under side `of Fig. 1. Fig.3 is a perspective view of the movable jaw, partly broken away to showthe interior construction. Fig. 4 is a plan view of the same, the keysor dogs being removed. Fig. 5 is a hori- Zonta-l section of the same.Fig. 6 is a perspective View of one of the keys or dogs. .,Fg. 7 is asectional View on the line 00,00, Fig. 1.

In said drawings the reference numeral l designates the shank. orSpanner consistingy of a rectangular metal bar having a stationary jaw 2at one end and at the other end prois formed with two sets or series ofaligned rack teeth 4, which sets or series are separated from each otherby a central longitudinal rib 5. As'will be seen the front ends of theseteeth are straight or at a right angle to the edge of the shank whilethe rear ends are beveled.

The numeral 6 designates the movable jaw having a rectangular borecorresponding with the shank which passes therethrough. Upon the upperside,near the rear end said jaw is formed with two slots or apertures 7,one in advance of the other a distance equal to half the distancebetween the rack teeth. These slots may be separated from each other bya rib 8. Aligned with the side or longitudinal ends of these slots arerectangular grooves 9, which connect at their lower ends withrectangular recesses 10, in the said jaw. These slots, grooves andrecesses are formed for the purpose of receiving the dogs or keyshereinafter described, and in the recesses l0 are located coiled springs12, for actuating said keys or dogs. The slots 7, are arranged side byside, but one slightly in advance of the other.

The numeral 13 designates the keys or dogs each -consisting of arectangular metal plate, having at one end, an inwardly projecting head14, which fits and works in the slots 7 and at the other end formed witha lug 15, formed on its inner side, with one or more teeth 152L as seenmore clearly in Fig. 6. These plates 13 are seated in the grooves 9,with their inner ends resting on the coiled springs in the recesses 10.

The operation is as follows: In any position to which the movable jawhas been adjusted, the teeth of one of the keys or dogs will engage withthe teeth of one set of rack teeth while the teethot the other key ordog will rest upon the point of one of the teeth of the other set orseries. If now the movable j aw be moved toward the stationaryjaw, thelast mentioned key or dog will engage with the teeth against which itslugrested while the rst mentioned key or dog will rest against theVpoint ot' the teeth in advance of thus be seen that the dogs or keysalternately engage with the teeth of their respective sets or series.The coiled springs in the recesses 10 serve to force the keys intoengagement with the rack teeth and by reason of the bevels on said teeththe keys can ride over the teeth when the movablev jaw is moved forwardbut prevent the latter from moving backward. By pressingupon the outerends of the keys or dogs they are thrown out of engagement with theteeth so as to allow the movable jaw to be moved away from thestationary jaw.

By providing the two sets of rack teeth and two keys or dogs, one inadvance of the other, as described, the teeth can be formed twice as farapart, and yet secure the same adj ust ment, as when a single set ofteeth and one key only are employed, thus adding greatly to the strengthof the teeth.

By providing the central rib between each set of teeth, injury to thelatter from pressure of the movable or sliding jaw is prevented.

The grooves 9, in the movable or sliding jaw are located upon oppositesides of the shank, and the lugs 15, of the dogs project inwardly or inopposite directions to each other.

I am aware that heretofore a wrench has been constructed, the shank ofwhich is provided with two sets of rack teeth,with which two separatedogs are adapted to alternately7 engage. These teeth however, are not inlateral alignment with each other--that is to say, the teeth of one setare located in planes midway between the teeth of the other set. Such 33 is not my invention and is not claimed by me.

Having thus described my invention, what I claim is-u In a monkeywrench, the combination with the shank havingastationaryjaw and formedto with two sets or series of aligned rack,teeth separated by a centrallongitudinal rib, the sliding jaw having a rectangular bore, tworectangular slots, located side by side, but one in advance of theother, two rectangular 45 grooves at opposite sides of the shank, andrecesses separated by a central rib, of the dogs consisting ofrectangular metal plates seated in said grooves having heads at theirouter ends and inwardly projecting beveled 5o toothed lugs at theirinner ends and the coiled springs located in said recesses,substantially as described.

In testimony that I claim the foregoing as my own I have hereuntoatiixed my signature 55 in presence of two witnesses.

J AMES C. MCQUILKIN. Witnesses:

CEAS. W. HURs'r, FRANK HAYS.

